Shotgun on one side, cartridge on the other.All you need really. Please be aware that these cufflinks are fixed both sides. As they don't swivel some smaller cuff holes will not take them. We have tried them on a variety of shirts and most of them work, but there are some that do not. Dimensions: Shotgun 28mm x 9mm (approx.) and Cartridge 23mm x 7mm (approx.) Weight per cufflink: approx. 7g (medium)